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      Question

      The speed of a boat in still water is 25 km/hr. If the

      boat covers 120 km in upstream in 12 hours, then find the time taken by the boat to travel 160 km in downstream.
      A 5 hours Correct Answer Incorrect Answer
      B 6 hours Correct Answer Incorrect Answer
      C 4 hours Correct Answer Incorrect Answer
      D 7 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 120/12 = 10 km/hr Or, 25 – y = 10 Or, y = 25 – 10 = 15 km/hr Therefore, downstream speed of the boat = 25 + 15 = 40 km/hr Required time taken = 160/40 = 4 hours

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